Electric-arc lamp.



110,730,369. PATENTEDJUNE 9, 1903. c. B. HARTHAN.

ELEOTRIG ARG LAMP.

' APPLICATION FILED FEB. 9, 1901.

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No. 730,369. PATBNTED JUNE 9. 1903.

c. E. HAR'I'HAN.

ELECTRIC ARC LAMP.

APPLIOA-TION FILED IBBJQ, 1901.

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Inoenbo n Charles Elfiarbh' an.

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PATENTED JUNE 9, 1903.

0. E. HARTHAN. ELE'GTRIG'ARGLAMP.

APPLIUA'I'ION FILED FEB. 9, 1901.

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No. 730,869. PATENTED JUNE 9, 1903.

0. E. HARTHAN. 4 ELECTRIC ARG LAMP.

APPLICATION FILED FEB. 9, 1901.

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N5. 730,369. I PATBNTBD JUNE 9. 1903.

0. E. HARTHAN.

ELEGTRIG ARC LAMP.

APPLICATION FILED FEB. 9, 1901.

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Char-lee El'rHarbhan,

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CHARLES UNITED STATES Patented June 9, 1903.

"PATENT OFFICE.

E. I-IARTHAN, OF LYNN, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEVV' YORK.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 730,369, dated June 9, 1903.-

I Application filed February 9, 1901. Serial 110.46.599. (No model.)

To all whom it may concern.-

Be it known that I, CHARLES E; I'IARTHAN,

acitizen of theUnited States, residing at Lynn, county of Essex, State of Massachusetts, have invented certain new and useful Improve ments in Electric-Arc Lamps, of which the following is a specification.

This invention relates to constant-current arc-lamps for direct-current series circuits. IO Its object is to improve certain details of construction by which a greater efficiency is secured and the lamp is rendered more compact. To this end a compensating winding is used on the shunt-coils, and the rocker which I5 connects the armatures of the series and shunt magnets is made in two separate overlapping independently pivoted parts c011- nected so as to move simultaneously.

In the accompanying drawings, Figures 1 2'0 and 2 are elevations of the lamp mechanism, showing two positions of the rocker. Fig. 3is a perspective view of the rocker on an enlarged scale. Fig. 4: is a sectional elevation of the shunt-coils and the starting resistance. Fig. 5 is a perspective View of the cut-out. Fig. 6 is an elevation of the carbon-tube. Fig. 7 is a section ofthe same. Fig. Sis a diagram of the circuits.

The frame of the lamp comprises the usual 0 base-plate A, surmounted by a disk A, of insulation, 011 which is erected the tubular backbone B and from which depends the tilting table C. Hangers D for the lower carbon-support are attached to the plate A. The upper end of the backbone fits into an opening-in a top plate E and is screw-threaded to receive a nut b and washer l), by which it is secured. Inside the backbone slides the upper carbon-holder B, connected by a flexi- 40 ble conductor B with a slit spring-plug B, supported in the upper end of the backbone by a cross-bar 11 having bent ends entering holes in the nut I).

The top plate E carries a number of binding-screws c for the several circuit-wires. A supporting-plate F is secured to the under side of the top plate E, being insulated therefrom, as by means of a mica sheet G.

.A top cap H covers the upper end of the lamp, being attached to studs f 011 the sup- 5o porting-plate F. The top cap carries the insulated suspending-dink H and the line-terminal-bindingposts I I. An inclosing casing K is suspended from screws h, inserted through the petticoat flange of the top cap.

Immediately under the supporting-plate are theseries magnet L and the shunt-magnet M, each comprising two spools. The plate F supports two resistanoe-coils N N, each consisting of a tubular insulating-column n, helically grooved to receive the bare wire a and supported by a bolt n passing through the plate F, the tubular column 07.,andwashers a into a..bearing-plate P. The series and shunt magnet spools are clamped between 6 the plates F and I, being symmetrically arranged on both sides of the backbone B. The clamping-bolts n and the resistance-coils are preferably at the ends of the bearing-plate between the two magnets. The cores of the magnets have conoidal, paraboloidal, or similar tapering ends Zm cooperating with perforated armatures L M. Each armature is carried on a rocker-arm R or R, fulcrumed in suitable bearings in the bearing-plate P. The bearings for the rocker-arm R are near the magnet M, while those for the rockerarm R are near the magnet L, so that the rockerarms overlap. Each rocker-arm is U shaped to straddle the backbone B, and one, as R, has its arms wider apart to cross outside of the arms of the rocker-arm R, as clearly shown in Fig. Attached to or integral with each rocker-arm is a rock-arm 7'1", projecting in the same direction from the same end of the rocker arms and having their outer ends connected by a pivoted link R A downward movement of one armature causes an upward movement of the other, and vice versa. The lengthof each rocker-arm is such that the arc described by the armature is flatter than would be possible if a single rocker of the walking-beam type were used with the magnets placed so near each other, as shown. The lamp is thus rendered more compact without losing the advantage of a flat arc of movement for the armatures. Attached to one of the rocker-arms is an inverted dash-pot S, cooperating with a stationary plunger S,pivoted to an arm 19 on the backbone I The upright clutch-rod T carries a bracket T, swiveled thereon and having pivoted to it on a horizontal axis an insulated contactblock U, preferably having a beveled edge a to make bridging contact with two spring terminals V on a slab of insulation v, in circuit with the starting resistance N. The swiveling and pivotal movements give a universal joint action to the bridging contact, so that it comes to rest squarely on the terminals V V.

The circuits of the lamp are shown in. the diagram Fig. 8. From the positive bindingpost I runs a lead 00, from which a branch 1 goes to the series coil L, another branch 2 to the starting resistance N, another branch 3 to the slide N of the adjusting resistance N, and a fourth branch 4 to the compensating coils 5,wound in multiple on the spools of the shunt-magnet H. A wire 6 connects the series magnet with the shuntqnagnet, and a wire 7 connects the shunt-magnet with the lead y, running to the negative binding-post I. The starting resistance is connected by wire 8 with one of the terminals V of the cut-out, the other terminal being connected with the negative lead y by the wire 9. The

adjusting resistance is connected with the upper carbon-holder, being thus in multiple with the series coil L. The compensating coils 5 are also in parallel with the series coil. A switch XV controls a short circuit 10 between the positive and negative bindingposts I I. The current passing through the series coil can be regulated by moving the slide N toward or away from the open end of the resistance-coil N, thereby cutting in or out more resistance and increasing or diminishing the voltage at the are. For variation in current of .2 of an ampere above or below a predetermined normal current for which the lamp is originally adjusted no change in the adjusting resistance is necessary. For a greater difference the resistance can be altered, as above described. A decrease in the current flowing through the resistance-coil also increases that in the compensating coils, which being wound in the same direction as the shunt-coil serve to compensate for the increased resistance of the shunt-winding due to heat and the consequent cutting down of the current and loss of magnetic strength, so as to maintain a differential balance between the shunt and series windings at any temperature.

It should be noted that when the series armature drops it passes nearly out of the field of the series magnet. The object of this is to obviate the so-called sneak feed and insure a positive feed of the carbon by the shunt-m agnet until the carbons are finally permitted to drop together, when the shuntmagnets are weakened to such an extent that the slight outlying field of the series magnet is able to attract the armature and reestablish the arc, and thereby again set up the differential balance'between the shunt and series windin That I claim as new, and desire to secure by Letters Patent of the United States, is-

1. In an arc-lamp,the combination with series and shunt magnets and feeding mechanism, of a lever system carrying the magnetarmat ures made in two overlapping parts independently fulcrumed.

2. In an arc-lamp, the combination with series and shunt magnets and feeding mechanism, of a lever system carrying the magnetarmatures made in two parts overlapping each other and fulcrumed in separate bearings.

3. In an arc-lamp, the combination with series and shunt magnets and feeding mecl anism, of a rocker system carrying the in agnetarmatures made in two overlapping parts fulcrumed in separate bearings and pivotally connected together.

4. In an arc-lamp, the combination with series and shunt magnets and feeding mechanism, of a rocker-arm for each magnet fulcrumed near the other magnet, and pivotal connection between said arms to-move them simultaneously.

5. In an arc-lamp, the combination with series and shunt magnets and feeding mechanism, of U -shaped rocker-arms crossing each other and pivotally connected.

6. In an arc-lamp, the combination with series and shunt magnets and feeding mechanism, of U shaped rocker-arms crossing one inside the other and pivotally connected.

7. In an arc-lamp, the combination with series and shunt magnets and feeding mechanism,of U -shaped rocker-arms crossing each other, a rock-arm on each, and a link connectin g the lOGIGFtllllS.

8. In an arc-lamp, the combination with series and shunt magnets and feeding mech anism, of a bearing-plate on which said magnets are supported, rocker-arms fulcrumed on said plate near said magnets and crossing each other, and connected rock-arms on said rocker-arms.

9. In an arc-lamp, the combination with a backbone, of series and shunt magnets each comprising two spools all arranged symmetrically around said backbone, a bearing-plate on which said spools are mounted, U-shaped rocker arms fulcrumed 011 said plate and crossing eachother astraddle of the backbone, and a pivotal connection between said rockerarms.

10. In an arc lamp, the Cjmbination with a backbone, of a supporting-plate attached thereto, abearin g-plate below the supportingplate, columns of insulation between said plates, bolts passing lengthwise through said columns, and magnet-spools clamped between said plates.

11. In an arc lamp, the combination with a backbone, of a supporting-plate attached series and shunt magnets, having conoidal thereto, a bearing-plate below the supportingplate, columns of insulation between said plates, bolts passing lengthwise through said columns, magnetspools clamped between said plates, and resistance-coils wound on said columns.

12. In an arclamp, the combination with series and shunt coils, of an adjusting resistance and compensating shunt-coils all in multiple with the series coil.

13. In an arc lamp, the combination with series and shunt magnets, of compensating coils wound on the shunt-magnet spools in parallel with each other and with the series magnet, and an adjusting resistance also in parallel with the series magnet.

14. In an arc-lamp, the combination with pole-pieces, of armatures connected to move together and each adapted to drop nearly out of the field by a sharp change of magnetic flux when the other is attracted.

15. In an arc -lamp, the combination with series and shunt magnets and feeding mechanism, of levers carrying the magnet-armatures and overlapping to secure greater length of lever relative to the diameter of the lampcasing.

In witness whepeof I have hereunto set my 30 hand this 6th day of February, 1901.

CHARLES E, I-IARTHAN.

v\Vitnesses:

DUGALD MoK. McKILLoP, HENRY O. WESTENDARP. 

